Motorhomes vary so much, each one is different, as owners place their stamp on them. also different usage , wear and tear, as you are living in Mh, where as a car you are just sitting in and driving from a to b. mileage IMO is not an issue, as high mileage is not a bad thing on a diesel engine. When looking for a secondhand Mh , look for layout, that suite your style of living, as mistakes can be costly